RELEVANT LINKS

A Course in Phonetics: Vowels and Consonants (Web supplements for Peter Ladefoged's _A Course in Phonetics_ [4th ed.] text. Excellent.) 
http://hctv.humnet.ucla.edu/departments/linguistics/VowelsandConsonants/A%20Course%20in%20phonetics/index1.html 
 
What is linguistics/phonetics? (Bulleted graphics; handy for first day of class)
http://www.speechandhearing.net/entrance/intro.html 
 
The vocal tract
http://www.umanitoba.ca/faculties/arts/linguistics/russell/138/sec1/anatomy.htm
 
The International Phonetic Alphabet
http://www2.arts.gla.ac.uk/IPA/pulmonic.html 
 
Summer Institute of Linguistics (SIL) homepage (IPA Help is excellent; also IPA fonts, many tools)
http://www.sil.org/ 
 
Plosives 2: Voicing onset time and aspiration (tutorial)
http://www.phon.ucl.ac.uk/home/johnm/siphtra/plostut2/plostut2.htm